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You can use the netstat tool built into Windows to see what ports are open and connected on the server. At a command prompt, simply enter netstat –an|more to get a page by page count of what TCP and UDP ports are open and listening. An even better way to go about doing this is to use Foundstone's Vision tool or Sysinternals' TCPView tool as shown below with the NetBus Trojan highlighted.

Sysinternals' TCPView maps open ports to actual executable files

This is another reason to know your SQL Server inside and out. If you know what you're looking at then you'll know what you're looking for.

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